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[PATCH] uml: MADV_REMOVE fixes

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MADV_REMOVE fixes - change the test mapping to be MAP_SHARED instead of
MAP_PRIVATE, as MADV_REMOVE on MAP_PRIVATE maps won't work.  Also, use
the kernel's definition of MADV_REMOVE instead of hardcoding it if there
isn't a libc definition.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jeff Dike 2006-04-18 22:20:24 -07:00 committed by Linus Torvalds
parent 676ff453e5
commit b73781c866
3 changed files with 6 additions and 2 deletions
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2
arch/um/include/sysdep-i386/kernel-offsets.h
View File

@ -1,6 +1,7 @@
#include <linux/stddef.h>
#include <linux/sched.h>
#include <linux/elf.h>
#include <asm/mman.h>
#define DEFINE(sym, val) \
asm volatile("\n->" #sym " %0 " #val : : "i" (val))
@ -16,6 +17,7 @@
void foo(void)
{
OFFSET(HOST_TASK_DEBUGREGS, task_struct, thread.arch.debugregs);
DEFINE(KERNEL_MADV_REMOVE, MADV_REMOVE);
#ifdef CONFIG_MODE_TT
OFFSET(HOST_TASK_EXTERN_PID, task_struct, thread.mode.tt.extern_pid);
#endif

2
arch/um/include/sysdep-x86_64/kernel-offsets.h
View File

@ -4,6 +4,7 @@
#include <linux/time.h>
#include <linux/elf.h>
#include <asm/page.h>
#include <asm/mman.h>
#define DEFINE(sym, val) \
asm volatile("\n->" #sym " %0 " #val : : "i" (val))
@ -18,6 +19,7 @@
void foo(void)
{
DEFINE(KERNEL_MADV_REMOVE, MADV_REMOVE);
#ifdef CONFIG_MODE_TT
OFFSET(HOST_TASK_EXTERN_PID, task_struct, thread.mode.tt.extern_pid);
#endif

4
arch/um/os-Linux/process.c
View File

@ -190,7 +190,7 @@ int os_unmap_memory(void *addr, int len)
}
#ifndef MADV_REMOVE
#define MADV_REMOVE 0x5 /* remove these pages & resources */
#define MADV_REMOVE KERNEL_MADV_REMOVE
#endif
int os_drop_memory(void *addr, int length)
@ -216,7 +216,7 @@ int can_drop_memory(void)
}
addr = mmap64(NULL, UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE, fd, 0);
MAP_SHARED, fd, 0);
if(addr == MAP_FAILED){
printk("Mapping test memory file failed, err = %d\n", -errno);
return 0;